sched/swait: Rename to exclusive
Since swait basically implemented exclusive waits only, make sure
the API reflects that.
$ git grep -l -e "\<swake_up\>"
-e "\<swait_event[^ (]*"
-e "\<prepare_to_swait\>" | while read file;
do
sed -i -e 's/\<swake_up\>/&_one/g'
-e 's/\<swait_event[^ (]*/&_exclusive/g'
-e 's/\<prepare_to_swait\>/&_exclusive/g' $file;
done
With a few manual touch-ups.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: bigeasy@linutronix.de
Cc: oleg@redhat.com
Cc: paulmck@linux.vnet.ibm.com
Cc: pbonzini@redhat.com
Link: https://lkml.kernel.org/r/20180612083909.261946548@infradead.org
This commit is contained in:
Peter Zijlstra
Thomas Gleixner
Родитель
0abf17bc77
Коммит
b3dae109fa
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@ -515,7 +515,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
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dvcpu->arch.wait = 0;
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if (swq_has_sleeper(&dvcpu->wq))
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swake_up(&dvcpu->wq);
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swake_up_one(&dvcpu->wq);
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return 0;
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}
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@ -1204,7 +1204,7 @@ static void kvm_mips_comparecount_func(unsigned long data)
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vcpu->arch.wait = 0;
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if (swq_has_sleeper(&vcpu->wq))
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swake_up(&vcpu->wq);
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swake_up_one(&vcpu->wq);
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}
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/* low level hrtimer wake routine */
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@ -216,7 +216,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
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wqp = kvm_arch_vcpu_wq(vcpu);
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if (swq_has_sleeper(wqp)) {
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swake_up(wqp);
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swake_up_one(wqp);
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++vcpu->stat.halt_wakeup;
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}
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@ -3188,7 +3188,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
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}
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}
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prepare_to_swait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
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prepare_to_swait_exclusive(&vc->wq, &wait, TASK_INTERRUPTIBLE);
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if (kvmppc_vcore_check_block(vc)) {
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finish_swait(&vc->wq, &wait);
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@ -3311,7 +3311,7 @@ static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
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kvmppc_start_thread(vcpu, vc);
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trace_kvm_guest_enter(vcpu);
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} else if (vc->vcore_state == VCORE_SLEEPING) {
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swake_up(&vc->wq);
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swake_up_one(&vc->wq);
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}
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}
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@ -1145,7 +1145,7 @@ void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
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* yield-candidate.
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*/
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vcpu->preempted = true;
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swake_up(&vcpu->wq);
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swake_up_one(&vcpu->wq);
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vcpu->stat.halt_wakeup++;
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}
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/*
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@ -154,7 +154,7 @@ void kvm_async_pf_task_wait(u32 token, int interrupt_kernel)
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for (;;) {
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if (!n.halted)
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prepare_to_swait(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
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prepare_to_swait_exclusive(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
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if (hlist_unhashed(&n.link))
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break;
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@ -188,7 +188,7 @@ static void apf_task_wake_one(struct kvm_task_sleep_node *n)
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if (n->halted)
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smp_send_reschedule(n->cpu);
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else if (swq_has_sleeper(&n->wq))
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swake_up(&n->wq);
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swake_up_one(&n->wq);
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}
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static void apf_task_wake_all(void)
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@ -1379,7 +1379,7 @@ static void apic_timer_expired(struct kvm_lapic *apic)
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* using swait_active() is safe.
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*/
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if (swait_active(q))
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swake_up(q);
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swake_up_one(q);
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if (apic_lvtt_tscdeadline(apic))
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ktimer->expired_tscdeadline = ktimer->tscdeadline;
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@ -16,7 +16,7 @@
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* wait-queues, but the semantics are actually completely different, and
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* every single user we have ever had has been buggy (or pointless).
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*
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* A "swake_up()" only wakes up _one_ waiter, which is not at all what
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* A "swake_up_one()" only wakes up _one_ waiter, which is not at all what
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* "wake_up()" does, and has led to problems. In other cases, it has
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* been fine, because there's only ever one waiter (kvm), but in that
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* case gthe whole "simple" wait-queue is just pointless to begin with,
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@ -115,7 +115,7 @@ extern void __init_swait_queue_head(struct swait_queue_head *q, const char *name
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* CPU0 - waker CPU1 - waiter
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*
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* for (;;) {
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* @cond = true; prepare_to_swait(&wq_head, &wait, state);
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* @cond = true; prepare_to_swait_exclusive(&wq_head, &wait, state);
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* smp_mb(); // smp_mb() from set_current_state()
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* if (swait_active(wq_head)) if (@cond)
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* wake_up(wq_head); break;
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@ -157,11 +157,11 @@ static inline bool swq_has_sleeper(struct swait_queue_head *wq)
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return swait_active(wq);
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}
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extern void swake_up(struct swait_queue_head *q);
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extern void swake_up_one(struct swait_queue_head *q);
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extern void swake_up_all(struct swait_queue_head *q);
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extern void swake_up_locked(struct swait_queue_head *q);
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extern void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state);
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extern void prepare_to_swait_exclusive(struct swait_queue_head *q, struct swait_queue *wait, int state);
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extern long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state);
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extern void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait);
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@ -196,7 +196,7 @@ __out: __ret; \
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(void)___swait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, \
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schedule())
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#define swait_event(wq, condition) \
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#define swait_event_exclusive(wq, condition) \
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do { \
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if (condition) \
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break; \
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@ -208,7 +208,7 @@ do { \
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TASK_UNINTERRUPTIBLE, timeout, \
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__ret = schedule_timeout(__ret))
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#define swait_event_timeout(wq, condition, timeout) \
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#define swait_event_timeout_exclusive(wq, condition, timeout) \
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({ \
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long __ret = timeout; \
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if (!___wait_cond_timeout(condition)) \
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@ -220,7 +220,7 @@ do { \
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___swait_event(wq, condition, TASK_INTERRUPTIBLE, 0, \
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schedule())
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#define swait_event_interruptible(wq, condition) \
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#define swait_event_interruptible_exclusive(wq, condition) \
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({ \
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int __ret = 0; \
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if (!(condition)) \
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@ -233,7 +233,7 @@ do { \
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TASK_INTERRUPTIBLE, timeout, \
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__ret = schedule_timeout(__ret))
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#define swait_event_interruptible_timeout(wq, condition, timeout) \
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#define swait_event_interruptible_timeout_exclusive(wq, condition, timeout)\
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({ \
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long __ret = timeout; \
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if (!___wait_cond_timeout(condition)) \
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@ -246,7 +246,7 @@ do { \
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(void)___swait_event(wq, condition, TASK_IDLE, 0, schedule())
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/**
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* swait_event_idle - wait without system load contribution
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* swait_event_idle_exclusive - wait without system load contribution
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* @wq: the waitqueue to wait on
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* @condition: a C expression for the event to wait for
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*
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@ -257,7 +257,7 @@ do { \
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* condition and doesn't want to contribute to system load. Signals are
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* ignored.
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*/
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#define swait_event_idle(wq, condition) \
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#define swait_event_idle_exclusive(wq, condition) \
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do { \
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if (condition) \
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break; \
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@ -270,7 +270,7 @@ do { \
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__ret = schedule_timeout(__ret))
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/**
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* swait_event_idle_timeout - wait up to timeout without load contribution
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* swait_event_idle_timeout_exclusive - wait up to timeout without load contribution
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* @wq: the waitqueue to wait on
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* @condition: a C expression for the event to wait for
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* @timeout: timeout at which we'll give up in jiffies
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@ -288,7 +288,7 @@ do { \
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* or the remaining jiffies (at least 1) if the @condition evaluated
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* to %true before the @timeout elapsed.
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*/
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#define swait_event_idle_timeout(wq, condition, timeout) \
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#define swait_event_idle_timeout_exclusive(wq, condition, timeout) \
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({ \
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long __ret = timeout; \
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if (!___wait_cond_timeout(condition)) \
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@ -92,7 +92,7 @@ static void s2idle_enter(void)
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/* Push all the CPUs into the idle loop. */
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wake_up_all_idle_cpus();
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/* Make the current CPU wait so it can enter the idle loop too. */
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swait_event(s2idle_wait_head,
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swait_event_exclusive(s2idle_wait_head,
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s2idle_state == S2IDLE_STATE_WAKE);
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cpuidle_pause();
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@ -160,7 +160,7 @@ void s2idle_wake(void)
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raw_spin_lock_irqsave(&s2idle_lock, flags);
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if (s2idle_state > S2IDLE_STATE_NONE) {
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s2idle_state = S2IDLE_STATE_WAKE;
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swake_up(&s2idle_wait_head);
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swake_up_one(&s2idle_wait_head);
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}
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raw_spin_unlock_irqrestore(&s2idle_lock, flags);
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}
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@ -110,7 +110,7 @@ void __srcu_read_unlock(struct srcu_struct *sp, int idx)
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WRITE_ONCE(sp->srcu_lock_nesting[idx], newval);
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if (!newval && READ_ONCE(sp->srcu_gp_waiting))
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swake_up(&sp->srcu_wq);
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swake_up_one(&sp->srcu_wq);
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}
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EXPORT_SYMBOL_GPL(__srcu_read_unlock);
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@ -140,7 +140,7 @@ void srcu_drive_gp(struct work_struct *wp)
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idx = sp->srcu_idx;
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WRITE_ONCE(sp->srcu_idx, !sp->srcu_idx);
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WRITE_ONCE(sp->srcu_gp_waiting, true); /* srcu_read_unlock() wakes! */
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swait_event(sp->srcu_wq, !READ_ONCE(sp->srcu_lock_nesting[idx]));
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swait_event_exclusive(sp->srcu_wq, !READ_ONCE(sp->srcu_lock_nesting[idx]));
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WRITE_ONCE(sp->srcu_gp_waiting, false); /* srcu_read_unlock() cheap. */
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/* Invoke the callbacks we removed above. */
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@ -1727,7 +1727,7 @@ static void rcu_gp_kthread_wake(struct rcu_state *rsp)
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!READ_ONCE(rsp->gp_flags) ||
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!rsp->gp_kthread)
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return;
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swake_up(&rsp->gp_wq);
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swake_up_one(&rsp->gp_wq);
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}
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/*
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@ -2002,7 +2002,7 @@ static bool rcu_gp_init(struct rcu_state *rsp)
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}
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/*
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* Helper function for swait_event_idle() wakeup at force-quiescent-state
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* Helper function for swait_event_idle_exclusive() wakeup at force-quiescent-state
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* time.
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*/
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static bool rcu_gp_fqs_check_wake(struct rcu_state *rsp, int *gfp)
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@ -2144,7 +2144,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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READ_ONCE(rsp->gpnum),
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TPS("reqwait"));
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rsp->gp_state = RCU_GP_WAIT_GPS;
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swait_event_idle(rsp->gp_wq, READ_ONCE(rsp->gp_flags) &
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swait_event_idle_exclusive(rsp->gp_wq, READ_ONCE(rsp->gp_flags) &
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RCU_GP_FLAG_INIT);
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rsp->gp_state = RCU_GP_DONE_GPS;
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/* Locking provides needed memory barrier. */
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@ -2176,7 +2176,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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READ_ONCE(rsp->gpnum),
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TPS("fqswait"));
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rsp->gp_state = RCU_GP_WAIT_FQS;
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ret = swait_event_idle_timeout(rsp->gp_wq,
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ret = swait_event_idle_timeout_exclusive(rsp->gp_wq,
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rcu_gp_fqs_check_wake(rsp, &gf), j);
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rsp->gp_state = RCU_GP_DOING_FQS;
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/* Locking provides needed memory barriers. */
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|
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@ -212,7 +212,7 @@ static void __rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
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raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
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if (wake) {
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smp_mb(); /* EGP done before wake_up(). */
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swake_up(&rsp->expedited_wq);
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swake_up_one(&rsp->expedited_wq);
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}
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break;
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}
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@ -518,7 +518,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
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jiffies_start = jiffies;
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for (;;) {
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ret = swait_event_timeout(
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ret = swait_event_timeout_exclusive(
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rsp->expedited_wq,
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sync_rcu_preempt_exp_done_unlocked(rnp_root),
|
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jiffies_stall);
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|
|
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|
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@ -1854,8 +1854,8 @@ static void __wake_nocb_leader(struct rcu_data *rdp, bool force,
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WRITE_ONCE(rdp_leader->nocb_leader_sleep, false);
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del_timer(&rdp->nocb_timer);
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raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
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smp_mb(); /* ->nocb_leader_sleep before swake_up(). */
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swake_up(&rdp_leader->nocb_wq);
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smp_mb(); /* ->nocb_leader_sleep before swake_up_one(). */
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swake_up_one(&rdp_leader->nocb_wq);
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} else {
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raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
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}
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|
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@ -2082,7 +2082,7 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
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*/
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trace_rcu_this_gp(rnp, rdp, c, TPS("StartWait"));
|
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for (;;) {
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swait_event_interruptible(
|
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swait_event_interruptible_exclusive(
|
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rnp->nocb_gp_wq[c & 0x1],
|
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(d = ULONG_CMP_GE(READ_ONCE(rnp->completed), c)));
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if (likely(d))
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|
|
@ -2111,7 +2111,7 @@ wait_again:
|
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/* Wait for callbacks to appear. */
|
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if (!rcu_nocb_poll) {
|
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trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, TPS("Sleep"));
|
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swait_event_interruptible(my_rdp->nocb_wq,
|
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swait_event_interruptible_exclusive(my_rdp->nocb_wq,
|
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!READ_ONCE(my_rdp->nocb_leader_sleep));
|
||||
raw_spin_lock_irqsave(&my_rdp->nocb_lock, flags);
|
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my_rdp->nocb_leader_sleep = true;
|
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|
|
@ -2176,7 +2176,7 @@ wait_again:
|
|||
raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
|
||||
if (rdp != my_rdp && tail == &rdp->nocb_follower_head) {
|
||||
/* List was empty, so wake up the follower. */
|
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swake_up(&rdp->nocb_wq);
|
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swake_up_one(&rdp->nocb_wq);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -2193,7 +2193,7 @@ static void nocb_follower_wait(struct rcu_data *rdp)
|
|||
{
|
||||
for (;;) {
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("FollowerSleep"));
|
||||
swait_event_interruptible(rdp->nocb_wq,
|
||||
swait_event_interruptible_exclusive(rdp->nocb_wq,
|
||||
READ_ONCE(rdp->nocb_follower_head));
|
||||
if (smp_load_acquire(&rdp->nocb_follower_head)) {
|
||||
/* ^^^ Ensure CB invocation follows _head test. */
|
||||
|
|
|
|||
|
|
@ -32,7 +32,7 @@ void swake_up_locked(struct swait_queue_head *q)
|
|||
}
|
||||
EXPORT_SYMBOL(swake_up_locked);
|
||||
|
||||
void swake_up(struct swait_queue_head *q)
|
||||
void swake_up_one(struct swait_queue_head *q)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
|
|
@ -40,7 +40,7 @@ void swake_up(struct swait_queue_head *q)
|
|||
swake_up_locked(q);
|
||||
raw_spin_unlock_irqrestore(&q->lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL(swake_up);
|
||||
EXPORT_SYMBOL(swake_up_one);
|
||||
|
||||
/*
|
||||
* Does not allow usage from IRQ disabled, since we must be able to
|
||||
|
|
@ -76,7 +76,7 @@ static void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *w
|
|||
list_add_tail(&wait->task_list, &q->task_list);
|
||||
}
|
||||
|
||||
void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state)
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||||
void prepare_to_swait_exclusive(struct swait_queue_head *q, struct swait_queue *wait, int state)
|
||||
{
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||||
unsigned long flags;
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||||
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||||
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|
@ -85,7 +85,7 @@ void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int
|
|||
set_current_state(state);
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||||
raw_spin_unlock_irqrestore(&q->lock, flags);
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||||
}
|
||||
EXPORT_SYMBOL(prepare_to_swait);
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||||
EXPORT_SYMBOL(prepare_to_swait_exclusive);
|
||||
|
||||
long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state)
|
||||
{
|
||||
|
|
@ -95,7 +95,7 @@ long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait
|
|||
raw_spin_lock_irqsave(&q->lock, flags);
|
||||
if (unlikely(signal_pending_state(state, current))) {
|
||||
/*
|
||||
* See prepare_to_wait_event(). TL;DR, subsequent swake_up()
|
||||
* See prepare_to_wait_event(). TL;DR, subsequent swake_up_one()
|
||||
* must not see us.
|
||||
*/
|
||||
list_del_init(&wait->task_list);
|
||||
|
|
|
|||
|
|
@ -604,7 +604,7 @@ void kvm_arm_resume_guest(struct kvm *kvm)
|
|||
|
||||
kvm_for_each_vcpu(i, vcpu, kvm) {
|
||||
vcpu->arch.pause = false;
|
||||
swake_up(kvm_arch_vcpu_wq(vcpu));
|
||||
swake_up_one(kvm_arch_vcpu_wq(vcpu));
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -612,7 +612,7 @@ static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
|
|||
{
|
||||
struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
|
||||
|
||||
swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
|
||||
swait_event_interruptible_exclusive(*wq, ((!vcpu->arch.power_off) &&
|
||||
(!vcpu->arch.pause)));
|
||||
|
||||
if (vcpu->arch.power_off || vcpu->arch.pause) {
|
||||
|
|
|
|||
|
|
@ -155,7 +155,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
|
|||
smp_mb(); /* Make sure the above is visible */
|
||||
|
||||
wq = kvm_arch_vcpu_wq(vcpu);
|
||||
swake_up(wq);
|
||||
swake_up_one(wq);
|
||||
|
||||
return PSCI_RET_SUCCESS;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -107,7 +107,7 @@ static void async_pf_execute(struct work_struct *work)
|
|||
trace_kvm_async_pf_completed(addr, gva);
|
||||
|
||||
if (swq_has_sleeper(&vcpu->wq))
|
||||
swake_up(&vcpu->wq);
|
||||
swake_up_one(&vcpu->wq);
|
||||
|
||||
mmput(mm);
|
||||
kvm_put_kvm(vcpu->kvm);
|
||||
|
|
|
|||
|
|
@ -2167,7 +2167,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
|
|||
kvm_arch_vcpu_blocking(vcpu);
|
||||
|
||||
for (;;) {
|
||||
prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
|
||||
prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
|
||||
|
||||
if (kvm_vcpu_check_block(vcpu) < 0)
|
||||
break;
|
||||
|
|
@ -2209,7 +2209,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
|
|||
|
||||
wqp = kvm_arch_vcpu_wq(vcpu);
|
||||
if (swq_has_sleeper(wqp)) {
|
||||
swake_up(wqp);
|
||||
swake_up_one(wqp);
|
||||
++vcpu->stat.halt_wakeup;
|
||||
return true;
|
||||
}
|
||||
|
|
|
|||
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